Can't exit out of flash mode

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If flashing fails once (for any reason), the bootloader will reset into Secure DFU Mode. Currently this mode isn't supported (as it needs a one-time key exchange to occur, which isn't ready yet).

To get around this you can either press the Esc key to go back to the firmware (or unplug and plug in the USB cable).

If that doesn't work, you've probably flashed the wrong file to the keyboard. Try flashing the default layout using the Kiibohd Configurator: https://github.com/kiibohd/controller...